Hold a dollar bill with its short sides parallel to the floor, and have a friend hold the thumb and forefinger of one hand on either side of the bottom edge, with the thumb and finger about \(20 \mathrm{~mm}\) apart. Offer your friend the following deal: He can keep the dollar if he can catch it between his thumb and finger after you release it. Most people fail to catch the bill. Use this information (and your measurement of the length of the long side of a dollar bill) to calculate a typical minimum reaction time.